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29 ANNUAL REPORT
Fiscal Year 1 965
Title: A Study of Biological, Chemical and Physical Nature of Water Quality Factors Under Utah Conditions,
Personnel: Dr, John M. Neuhold, Norman B, Jones. Susan S, Martin, and
John Matthew s.
Description of Work Performed:
The first study of physical, chemical, and biological aspects of water quality factors under Utah conditions was initiated on the Logan City. Utah,, sewage out¬ flow system and the confluent Logan River. The system is defined by two sewage outfalls collected into an open, rel atively high velocity flow ditch which extends west from Logan for 12 miles before broadening into an 11-acre lagoon. Water and sewage passes through the lagoon into the Logan River by natural fall (Figure 1). During summer months water is diverted from the lagoon (and consequently the Logan River) for irrigation use.
The purpose of the study is to construct a quantitatively descriptive model of the sewage system and its receiving environment by utilizing observations on the patterns of flow, water chemistry dynamics, bacterial activity and distribution, benthic fauna and flora distribution^ and aquatic fauna and flora distribution. Once the model is constructed, it will be tested on a system of waste stabilization ponds that are contemplated to replace the existing disposal system within the next two years. The relatively high dilution of the Logan sewage by groundwater, the existence of a small impoundment and the aeration effect of a relatively long open channel between the outfall and the river provide an opportunity for rather sensitive resolution of physical, chemical, and biological factors associated with changing water quality. This opportunity can form the background for water quality control (and its implications) of a formal treatment by the contemplated waste stabilization ponds.
Arrangements have been made to add the services of Dr, Fred Post, bacteriologist and project associate; Mr, Gary Beers, benthic production specialist and research assistant; and Mr. Al Collotzi, plankton and drift organism specialist and research assistant.

29 ANNUAL REPORT
Fiscal Year 1 965
Title: A Study of Biological, Chemical and Physical Nature of Water Quality Factors Under Utah Conditions,
Personnel: Dr, John M. Neuhold, Norman B, Jones. Susan S, Martin, and
John Matthew s.
Description of Work Performed:
The first study of physical, chemical, and biological aspects of water quality factors under Utah conditions was initiated on the Logan City. Utah,, sewage out¬ flow system and the confluent Logan River. The system is defined by two sewage outfalls collected into an open, rel atively high velocity flow ditch which extends west from Logan for 12 miles before broadening into an 11-acre lagoon. Water and sewage passes through the lagoon into the Logan River by natural fall (Figure 1). During summer months water is diverted from the lagoon (and consequently the Logan River) for irrigation use.
The purpose of the study is to construct a quantitatively descriptive model of the sewage system and its receiving environment by utilizing observations on the patterns of flow, water chemistry dynamics, bacterial activity and distribution, benthic fauna and flora distribution^ and aquatic fauna and flora distribution. Once the model is constructed, it will be tested on a system of waste stabilization ponds that are contemplated to replace the existing disposal system within the next two years. The relatively high dilution of the Logan sewage by groundwater, the existence of a small impoundment and the aeration effect of a relatively long open channel between the outfall and the river provide an opportunity for rather sensitive resolution of physical, chemical, and biological factors associated with changing water quality. This opportunity can form the background for water quality control (and its implications) of a formal treatment by the contemplated waste stabilization ponds.
Arrangements have been made to add the services of Dr, Fred Post, bacteriologist and project associate; Mr, Gary Beers, benthic production specialist and research assistant; and Mr. Al Collotzi, plankton and drift organism specialist and research assistant.